(1)化简:8(a-b)2+4(a-b)+5(b-a)-6(b-a)2
(2)化简:3x3-[x3+(6x2-7x)]-2(x3-3x2-4x)
(1)
(2)15x
1. What’s for dinner? I’m (饿死).
2. Nothing (满意)him. He is always complaining.
3. His (祖先)had come to England as refugees(难民).
4. The (起源)of the custom are unknown.
5. Mr. Smith bought his wife a g (真正的)diamond necklace in memory of their tenth wedding anniversary.
6. It’s bad (礼貌)to talk in a loud voice on the mobile phone in public.
7. Vancouver is (包围)by mountains on the north and east.
8. With the Internet news from every part of the world (传播)rapidly.
9. Give Mary a call, she needs ____________________(振作).
10. A plastic bag was seen (漂浮)in the water.
电杆连接时,当采用钢圈连接的钢筋混凝土杆时宜采用()连接。
A.法兰盘螺栓
B.插入式
C.电弧焊接
D.气焊焊接